Chevron U.s.a. Inc.

Los Alamos National Security, LLC

Caréne S Larmat

Paul Allan Johnson

Cung Khac Vu

Pierre-Yves Le Bas

Robert A Guyer

Kurt Nihei

James A Ten Cate

A system and a method includes generating a first signal at a first frequency; and a second signal at a second frequency. Respective sources are positioned within the borehole and controllable such that the signals intersect in an intersection volume outside the borehole. A receiver detects a difference signal returning to the borehole generated by a non-linear mixing process within the intersection volume, and records the detected signal and stores the detected signal in a storage device and records measurement parameters including a position of the first acoustic source, a position of the second acoustic source, a position of the receiver, elevation angle and azimuth angle of the first acoustic signal and elevation angle and azimuth angle of the second acoustic signal.

Data acquisition and processing system and method for investigating sub-surface features of a rock formation

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Los Alamos, NM, United States of America

Caréne S Larmat